9. Stockholders’ Equity (Details 1) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Shares
Outstanding at December 31, 2014	4,551
Granted	2,808
Exercised	(39)
Cancelled	(290)
Expired	0
Outstanding at September 30, 2015	7,030
Vested and expected to vest, end of period	6,104
Vested and exercisable, end of period	1,250
Average Exercise Price
Outstanding at December 31, 2014 | $ / shares	$ 5.35
Granted | $ / shares	6.19
Exercised | $ / shares	3.92
Cancelled | $ / shares	8.50
Expired | $ / shares	0
Outstanding at September 30, 2015 | $ / shares	5.56
Vested and expected to vest, end of period | $ / shares	5.52
Vested and exercisable, end of period | $ / shares	$ 4.87
Weighted Average Remaining Contractual Life Years
Options outstanding at September 30, 2015	8 years 324 days
Options vested and expected to vest, end of period	8 years 324 days
Options vested and exercisable, end of period	7 years 324 days
Aggregate Intrinsic Value
Exercised | $	$ 211
Options outstanding at September 30, 2015 | $	1,404
Options vested and expected to vest as of June 30, 2015 | $	1,260
Options vested and exercisable, end of period | $	$ 435