Stock-Based Compensation - Employee Stock Purchase Plan (Details)
|
|
|
1 Months Ended |
12 Months Ended |
|
|
|
Oct. 30, 2015
$ / shares
|
Mar. 05, 2015
$ / shares
|
Jan. 31, 2015
USD ($)
offering_period
shares
|
Dec. 31, 2015
USD ($)
offering_period
shares
|
Nov. 01, 2015
$ / shares
|
Dec. 31, 2014
shares
|
| Stock-Based compensation |
|
|
|
|
|
|
| Total shares reserved |
|
|
|
6,261,008
|
|
18,423,941
|
| Intrinsic value of shares of stock purchased under ESPP | $ |
|
|
|
$ 100,000
|
|
|
| 2015 Employee Stock Purchase Plan |
|
|
|
|
|
|
| Stock-Based compensation |
|
|
|
|
|
|
| Maximum percentage of eligible compensation per employee to purchase shares of common stock |
|
|
15.00%
|
|
|
|
| Maximum number of shares per offering period per employee |
|
|
1,500
|
|
|
|
| Maximum share value per calendar year per employee | $ |
|
|
$ 25,000
|
|
|
|
| Employee purchase price, percentage of fair market value of common stock |
85.00%
|
85.00%
|
85.00%
|
|
|
|
| Number of offering periods under terms of plan | offering_period |
|
|
2
|
2
|
|
|
| Fair market value of common stock (in usd per share) | $ / shares |
$ 4.82
|
$ 11.50
|
|
|
$ 4.89
|
|
| Offering periods beginning on May 1 and November 1 |
|
|
6 months
|
|
|
|
| Issuance of common stock under employee stock purchase plan (in shares) |
|
|
|
133,728
|
|
|
| Accumulated employee withholdings | $ |
|
|
|
$ 200,000
|
|
|
| Number of employment hours requirement per week during requisite service period |
|
|
20 hours
|
|
|
|
| Offering period, maximum |
|
|
27 months
|
|
|
|
| Total shares reserved |
|
|
375,000
|
241,272
|
|
0
|
| Number of shares option, minimum annual increase in number of shares reserved for issuance |
|
|
250,000
|
|
|
|
| Percentage of common stock outstanding option, minimum annual increase in number of shares reserved for issuance (as a percent) |
|
|
1.00%
|
|
|
|
| Discount on purchase of stock (as a percent) |
|
|
|
15.00%
|
|
|
| Unrecognized compensation cost related to nonvested share-based compensation arrangements | $ |
|
|
|
$ 100,000
|
|
|
| Expected weighted-average period for recognition of unrecognized stock-based compensation costs (in years) |
|
|
|
3 months 29 days
|
|
|
| 2015 Employee Stock Purchase Plan | Call Option |
|
|
|
|
|
|
| Stock-Based compensation |
|
|
|
|
|
|
| Fair value of option (as a percent) |
|
|
|
85.00%
|
|
|
| 2015 Employee Stock Purchase Plan | Put Option |
|
|
|
|
|
|
| Stock-Based compensation |
|
|
|
|
|
|
| Fair value of option (as a percent) |
|
|
|
15.00%
|
|
|
| 2015 Employee Stock Purchase Plan | Minimum |
|
|
|
|
|
|
| Stock-Based compensation |
|
|
|
|
|
|
| Requisite service period for award eligibility per year |
|
|
5 months
|
|
|
|