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v3.19.1

Stock-Based Compensation, Summary of Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation [Abstract] |  |  |  |
Per share market price of common stock on last trading day of year (in dollars per share) | $ 2.40 |  |  |
Proceeds from exercise of options | $ 135 | $ 22 | $ 20 |
Stock Options [Member] |  |  |  |
Options, number of shares [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 5,138,066 | 5,378,571 | 4,999,928 |
Options granted (in shares) | 1,095,000 | 1,613,500 | 429,000 |
Options exercised (in shares) | (117,229) | (12,500) | (50,357) |
Options cancelled (in shares) | (117,000) | (1,841,505) |  |
Outstanding, end of period (in shares) | 5,998,837 | 5,138,066 | 5,378,571 |
Options exercisable, end of period (in shares) | 3,855,119 |  |  |
Options, weighted average exercise price [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 8.41 | $ 8.52 | $ 8.76 |
Options granted (in dollars per share) | 3.52 | 4.06 | 4.77 |
Options exercised (in dollars per share) | 1.15 | 1.74 | 0.40 |
Options cancelled (in dollars per share) | 5.34 | 4.71 |  |
Outstanding, end of period (in dollars per share) | 7.72 | $ 8.41 | $ 8.52 |
Options exercisable, end of period (in dollars per share) | $ 9.87 |  |  |
Options, additional disclosures [Abstract] |  |  |  |
Options outstanding, weighted average remaining contractual life | 6 years 1 month 28 days |  |  |
Options exercisable, weighted average remaining contractual life | 4 years 8 months 26 days |  |  |
Options outstanding, aggregate intrinsic value | $ 810 |  |  |
Options exercisable, aggregate intrinsic value | 809 |  |  |
Share-based Compensation [Abstract] |  |  |  |
Proceeds from exercise of options | 135 | $ 22 | $ 20 |
Total intrinsic value of options exercised | $ 46 | $ 25 | $ 91 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
RSUs, number of RSUs [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 469,661 | 423,435 | 359,956 |
RSUs granted (in shares) | 246,663 | 220,664 | 219,331 |
RSUs vested (in shares) | (211,330) | (174,438) | (155,852) |
Outstanding, end of period (in shares) | 504,994 | 469,661 | 423,435 |
RSUs, weighted average grant date fair value [Abstract] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 5.19 | $ 8.08 | $ 13.22 |
RSUs granted (in dollars per share) | 3.26 | 3.83 | 4.75 |
RSUs vested (in dollars per share) | 6.19 | 10.47 | 15.27 |
Outstanding, end of period (in dollars per share) | $ 3.83 | $ 5.19 | $ 8.08 |
RSUs, aggregate intrinsic value [Abstract] |  |  |  |
Outstanding, end of period | $ 0 | $ 0 | $ 0 | $ 0

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