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L. SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of option activity |
|  |  |  |  |  |  | Weighted |  |  |  |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  |  |  |  | Average |  |  |
|  |  |  | Average |  | Share Price |  | Weighted |  | Remaining |  | Aggregate
|  | Number of |  | Exercise |  | on Date of |  | Average |  | Contractual |  | Intrinsic
|  | shares |  | Price |  | Exercise |  | Fair Value |  | Life |  | Value
|  | (in thousands, except price data)
Outstanding, January 1, 2014 |  | 1,468 |  | $ | 8.38 |  |  |  |  |  | 4.17 |  |  |  | $ | 9,731
Granted |  | 108 |  |  | 13.84 |  |  |  |  |  | 7.24 |  |  |  |  | —
Exercised |  | (104) |  |  | 6.22 |  |  |  |  |  | 2.57 |  |  |  |  | 1,476
Forfeited |  | (48) |  |  | 8.23 |  |  |  |  |  | 5.43 |  |  |  |  | 628
Expired |  | (1) |  |  | 6.21 |  |  |  |  |  | 2.21 |  |  |  |  | 11
Outstanding, December 31, 2014 |  | 1,423 |  |  | 8.96 |  |  |  |  |  | 4.48 |  |  |  |  | 3,486
Exercised |  | (81) |  |  | 7.09 |  | $ | 16.53 |  |  | 2.62 |  |  |  |  | 762
Forfeited |  | (32) |  |  | 8.96 |  |  |  |  |  | 4.43 |  |  |  |  | 212
Outstanding, December 31, 2015 |  | 1,310 |  |  | 9.07 |  |  |  |  |  | 4.59 |  |  |  |  | 10,598
Exercised |  | (159) |  |  | 6.91 |  | $ | 19.90 |  |  | 2.56 |  |  |  |  | 2,071
Forfeited |  | (21) |  |  | 7.96 |  |  |  |  |  | 3.29 |  |  |  |  | 273
Outstanding, December 31, 2016 |  | 1,130 |  | $ | 9.40 |  |  |  |  | $ | 4.90 |  | 6.412 |  | $ | 15,872
Exercisable, December 31, 2016 |  | 877 |  | $ | 9.18 |  |  |  |  | $ | 4.78 |  | 6.333 |  | $ | 12,499
Vested and expected to vest |  | 1,122 |  | $ | 9.39 |  |  |  |  | $ | 4.90 |  | 6.409 |  | $ | 15,767
Summary of RSU activity |
|  |  |  | Weighted |  |  |  |  |  |
|  |  |  | Average Share |  | Weighted |  | Aggregate
|  | Number of |  | Price on Date |  | Average Fair |  | Intrinsic
|  | shares |  | of Release |  | Value |  | Value
|  | (in thousands, except price data)
Outstanding at January 1, 2014 |  | 33 |  |  |  |  |  | 10.00 |  |  |
Granted |  | 25 |  |  |  |  |  | 18.45 |  |  |
Released |  | (33) |  |  |  |  |  | 10.57 |  |  |
Cancelled/Forfeited |  | (4) |  |  |  |  |  | 18.20 |  |  |
Outstanding, December 31, 2014 |  | 21 |  |  |  |  |  | 18.22 |  |  | 238
Granted |  | 156 |  | $ | 13.62 |  |  | 11.06 |  |  | 1,722
Released |  | (19) |  |  |  |  |  | 18.24 |  |  | 257
Cancelled/Forfeited |  | (6) |  |  |  |  |  | 10.00 |  |  | 99
Outstanding, December 31, 2015 |  | 152 |  |  |  |  |  | 11.20 |  |  | 2,611
Granted |  | 497 |  |  |  |  |  | 15.73 |  |  | 7,815
Released |  | (122) |  | $ | 13.50 |  |  | 14.08 |  |  | 1,644
Cancelled/Forfeited |  | (10) |  |  |  |  |  | 15.38 |  |  | 180
Outstanding, December 31, 2016 |  | 517 |  |  |  |  | $ | 14.79 |  | $ | 12,128
Exercisable, December 31, 2016 |  | 25 |  |  |  |  | $ | 11.41 |  | $ | 575
Vested and expected to vest |  | 501 |  |  |  |  | $ | 14.77 |  | $ | 11,752
Assumptions used |
|  | 2014 |  |  |  |  |
Expected volatility |  | 52 | % |  |  |  |
Risk-free interest rate |  | 1.89 | % |  |  |  |
Expected term (years) |  | 6.25 |  |  |  |  |
Expected dividend yield |  | — |  |  |  |  |
Estimated forfeitures |  | 7.50 | % |  |  |  |
Schedule of employee stock-based compensation expenses | Share-Based compensation - by expense type
|  | 2016 |  | 2015 |  | 2014 |
|  | (in thousands) |
Cost of goods sold |  | $ | 190 |  | $ | 70 |  | $ | 88 |
Research and development |  |  | 591 |  |  | 230 |  |  | 115 |
Sales and marketing |  |  | 357 |  |  | 217 |  |  | 98 |
General and administrative |  |  | 2,695 |  |  | 1,603 |  |  | 1,760 |
Total share-based compensation expense |  | $ | 3,833 |  | $ | 2,120 |  | $ | 2,061 |
Share-Based compensation - by award type
|  | 2016 |  | 2015 |  | 2014 |
|  | (in thousands) |
Employee stock options |  | $ | 1,460 |  | $ | 1,538 |  | $ | 1,660 |
Restricted stock units |  |  | 2,373 |  |  | 582 |  |  | 385 |
Warrants |  |  | — |  |  | — |  |  | 16 |
Total share-based compensation expense |  | $ | 3,833 |  | $ | 2,120 |  | $ | 2,061 |

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