Stock-Based Awards - RSUs (Details) - Restricted stock unit awards	3 Months Ended
	Mar. 31, 2020 $ / shares shares
RSU, Number of Units
Units outstanding, beginning of period | shares	3,592,915
Granted | shares	977,385
Vested | shares	(430,896)
Forfeited and cancelled | shares	(269,345)
Units outstanding, end of period | shares	3,870,059
RSU, Weighted Average Grant Date Fair Value Per Unit
Weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares	$ 4.62
Granted, estimated grant-date fair value (in dollars per share) | $ / shares	1.26
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	6.62
Forfeited and cancelled, estimated grant date fair value (in dollars per share) | $ / shares	4.96
Weighted average grant date fair value, ending balance (in dollars per share) | $ / shares	$ 3.52