Stock-based Awards (Details - Options) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Additional disclosure
Stock-based compensation expense	$ 5,607		$ 6,805	$ 17,632	$ 30,260
Options
Number of Options
Outstanding at the beginning of period (in shares)		10,625,980		10,625,980
Granted (in shares)				2,060,028
Exercised (in shares)				(39,695)
Canceled/forfeited (in shares)				(1,739,430)
Outstanding at the end of the period (in shares)	10,906,883			10,906,883
Weighted-Average Exercise Price
Outstanding at the beginning of period (in dollars per share)		$ 11.22		$ 11.22
Granted (in dollars per share)				3.02
Exercised (in dollars per share)				2.12
Canceled/forfeited (in dollars per share)				12.13
Outstanding at the end of the period (in dollars per share)	$ 9.56			$ 9.56
Additional disclosure
Weighted average remaining contractual life (in years)		5 years 2 months 12 days		5 years 2 months 12 days
Remaining stock-based compensation expense for unvested awards	$ 8,800			$ 8,800
Weighted average period over which remaining stock based compensation expense for unvested awards is expected to be recognized				2 years 4 months 24 days
Stock-based compensation expense	$ 1,300		$ 1,800	$ 4,300	$ 11,600