Stock-Based Compensation - Additional Information (Details) - USD ($)
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1 Months Ended |
3 Months Ended |
4 Months Ended |
Mar. 31, 2018 |
Jun. 30, 2013 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
| Performance Contingent Stock Options Granted to Employees |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Estimated fair value of stock options granted |
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400,000
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| Compensation cost recognized |
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$ 0
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| Performance Contingent Stock Options Granted to Employees | Executive Officer |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option awards exercisable |
53,575
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53,575
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| Weighted average exercise price |
$ 3.42
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$ 3.42
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| Performance Contingent Stock Options Awards |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Compensation cost recognized |
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$ 0
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$ 0
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| Stock option awards outstanding |
329,498
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329,498
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275,922
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| Stock option awards, fair value |
$ 700,000
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$ 700,000
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$ 300,000
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| Performance and Market Contingent Stock Options Granted to Employees |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Compensation cost recognized |
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$ 0
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$ 0
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| Stock option awards outstanding |
454,584
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454,584
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360,594
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| Stock option awards, fair value |
$ 1,000,000
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$ 1,000,000
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$ 400,000
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| Performance and Market Contingent Stock Options Granted to Employees | Vesting 1 |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option awards exercisable |
53,575
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53,575
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| Vesting rights |
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(i) the closing of a financing where the Company sells shares of its equity securities to institutional investors at a minimum price per share, (ii) a change in control with aggregate proceeds payable to the Company’s common stock at a minimum price per share, or (iii) an initial public offering that becomes effective at a minimum specified price per share
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| Trailing period for Initial public offering that becomes effective or achievement with a minimum market capitalization |
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30 days
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| Performance and Market Contingent Stock Options Granted to Employees | Vesting 2 |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option awards exercisable |
107,152
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107,152
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| Vesting rights |
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(i) the closing of a financing where the Company sells shares of its equity securities to institutional investors at a minimum pre-money valuation, (ii) a change in control with a minimum aggregate proceeds payable to the Company’s common stock, or (iii) an initial public offering that becomes effective or an achievement of a minimum market capitalization, as measured by a trailing 30 day volume-weighted average price.
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| Performance and Market Contingent Stock Options Granted to Employees | Executive Team |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Weighted average exercise price |
$ 3.42
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$ 3.42
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| Estimated fair value of stock options granted |
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|
700,000
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| Performance and Market Contingent Stock Options Granted to Employees | Executive Team | Common Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option awards exercisable |
160,727
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160,727
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| 2018 Employee Stock Purchase Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Common stock, capital shares reserved for future issuance |
536,242
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536,242
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| 2018 Incentive Award Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Common stock, capital shares reserved for future issuance |
4,289,936
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4,289,936
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| Vesting period, options |
4 years
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| 2018 Incentive Award Plan | Maximum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Expiration period from the date of grant, options |
10 years
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| 2018 Incentive Award Plan | Minimum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Exercise price as a percentage of estimated fair value of the shares on the date of grant |
100.00%
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| 2013 Equity Incentive Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting period, options |
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4 years
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| Number of shares of common stock authorized for issuance |
450,233
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450,233
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| Exercise price |
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$ 3.42
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| Exercise price range, lower range limit |
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3.95
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| Exercise price range, upper range limit |
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$ 5.43
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| Estimated fair value of stock options granted |
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493,776
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| Stock option awards outstanding |
4,263,969
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4,263,969
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4,196,203
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| 2013 Equity Incentive Plan | Maximum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Expiration period from the date of grant, options |
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10 years
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| 2013 Equity Incentive Plan | Minimum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Exercise price as a percentage of estimated fair value of the shares on the date of grant |
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100.00%
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| Exercise price as a percentage of estimated grant date fair value of shares for a 10% shareholder |
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110.00%
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