Stock Incentive Plans - Additional Information (Detail) - USD ($)
|
|
12 Months Ended |
|
|
|
Jan. 02, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Apr. 21, 2016 |
Jan. 01, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Total intrinsic value of options exercised |
|
$ 7,100
|
|
|
|
|
|
| Total unrecognized compensation costs related to stock options and RSUs |
|
$ 1,600,000
|
|
|
|
|
|
| Stock options and RSUs expected weighted average period |
|
2 years 2 months 12 days
|
|
|
|
|
|
| Fair market value of Company's common stock |
|
$ 2.70
|
|
|
|
|
|
| Weighted average fair value of options to purchase common stock granted |
|
$ 2.05
|
$ 2.53
|
$ 4.81
|
|
|
|
| Total fair value of options vested during period |
|
$ 1,100,000
|
|
|
|
|
|
| Proceeds from issuances of common stock under equity incentive plans |
|
$ 304,000
|
$ 203,000
|
$ 0
|
|
|
|
| Shares available for issuance |
|
365,074
|
361,672
|
718,007
|
|
|
332,995
|
| Share-based compensation expense, tax benefit recognized |
|
$ 0
|
|
|
|
|
|
| Share-based compensation costs, capitalized |
|
0
|
|
|
|
|
|
| Share based compensation, Total expensed |
|
1,998,000
|
$ 1,341,000
|
$ 535,000
|
|
|
|
| General and administrative [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Share based compensation, Total expensed |
|
$ 1,249,000
|
812,000
|
390,000
|
|
|
|
| Non Employee Director [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Number of shares issued |
|
104,941
|
|
|
|
|
|
| Fair value of shares issued |
|
$ 563,000
|
|
|
|
|
|
| Non Employee Director [Member] | General and administrative [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Share based compensation, Total expensed |
|
271,000
|
$ 255,000
|
$ 94,000
|
|
|
|
| Restricted Stock Units (RSUs) [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Intrinsic value of RSUs |
|
827,000
|
|
|
|
|
|
| Total unrecognized compensation costs related to stock options and RSUs |
|
$ 1,200,000
|
|
|
|
|
|
| Stock options and RSUs expected weighted average period |
|
2 years 10 months 6 days
|
|
|
|
|
|
| RSUs vest annual equal increments (in years) |
|
4 years
|
|
|
|
|
|
| RSUs granted period |
|
2015-03
|
|
|
|
|
|
| Inducement Plan [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| RSUs granted period |
|
2016-06
|
|
|
|
|
|
| 2014 Equity Incentive Plan [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Shares reserved for issuance of common stock |
|
838,695
|
|
|
|
357,075
|
|
| Outstanding shares of common stock, in percentage |
4.00%
|
|
|
|
|
|
|
| 2014 Equity Incentive Plan [Member] | Maximum [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Maximum number of shares may be added to the plan hereunder |
|
865,252
|
|
|
|
|
|
| 2016 Inducement Plan [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Maximum number of common stock shares that might be granted |
|
|
|
|
155,500
|
|
|
| 2014 Employee Stock Purchase Plan [Member] |
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
| Shares issued under ESPP |
|
67,256
|
36,696
|
|
|
|
|
| Proceeds from issuances of common stock under equity incentive plans |
|
$ 300,000
|
$ 400,000
|
|
|
|
|
| Shares available for issuance |
|
253,117
|
|
|
|
|
|
| Applicable exercise date an offering period shall be equal to percentage of the lesser of fair market value of common stock |
|
85.00%
|
|
|
|
|
|