9. Stockholders’ Equity (Details 1) - 6 months ended Jun. 30, 2015 - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
Shares
Outstanding at December 31, 2014	4,551
Granted	1,088
Exercised	(39)
Cancelled	(208)
Expired	0
Outstanding at June 30, 2015	5,392
Vested and expected to vest, end of period	4,578
Vested and exercisable, end of period	1,044
Average Exercise Price
Outstanding at December 31, 2014	$ 5.35
Granted	8.49
Exercised	3.92
Cancelled	8.68
Expired	0
Outstanding at June 30, 2015	5.86
Vested and expected to vest, end of period	5.80
Vested and exercisable, end of period	$ 4.85
Weighted Average Remaining Contractual Life Years
Options outstanding at June 30, 2015	8 years 10 months 24 days
Options vested and expected to vest, end of period	8 years 9 months 18 days
Options vested and exercisable, end of period	8 years
Aggregate Intrinsic Value
Exercised	$ 211
Options outstanding at June 30, 2015	7,227
Options vested and expected to vest as of June 30, 2015	6,293
Options vested and exercisable, end of period	$ 1,910