Stock-based Awards (Details - Options) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Additional disclosure
Stock-based compensation expense	$ 5,907	$ 5,892
Options
Number of Options
Outstanding at the beginning of period (in shares)	24,541,512
Granted (in shares)	350,010
Exercised (in shares)	(2,637,730)
Canceled/forfeited (in shares)	(431,062)
Outstanding at the end of the period (in shares)	21,822,730		24,541,512
Weighted-Average Exercise Price
Outstanding at the beginning of period (in dollars per share)	$ 8.29
Granted (in dollars per share)	13.94
Exercised (in dollars per share)	3.16
Canceled/forfeited (in dollars per share)	7.99
Outstanding at the end of the period (in dollars per share)	$ 9.01		$ 8.29
Additional disclosure
Weighted average remaining contractual life (in years)	5 years 7 months 28 days		5 years 5 months 27 days
Remaining stock-based compensation expense for unvested awards	$ 30,500
Weighted average period over which remaining stock based compensation expense for unvested awards is expected to be recognized	2 years 10 months 21 days
Stock-based compensation expense	$ 3,300	$ 3,800