Equity Incentive Plans - Summary of Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Summary of the activity of stock option awards, shares
Options outstanding, Beginning Balance (in Shares)	1,590
Options granted (in shares)	480
Options forfeited/canceled/expired (in shares)	(23)
Options outstanding, Ending Balance (in Shares)	2,047	1,590
Options vested and expected to vest (in Shares)	1,909
Options exercisable (in Shares)	1,087
Summary of the activity of stock option awards, weighted average exercise price
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price (in dollars per share)	$ 24.29
Options granted, Wtd. Avg. Exercise Price (in dollars per share)	14.64
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price (in dollars per share)	25.68
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price (in dollars per share)	22.02	$ 24.29
Options vested and expected to vest, Wtd. Average Exercise Price (in dollars per share)	22.30
Options exercisable, Wtd. Avg. Exercise Price (in dollars per share)	$ 24.57
Options outstanding, Ending Balance, Wtd. Avg. Remaining Contractual Term	7 years 5 months 8 days	6 years 10 months 24 days
Options vested and expected to vest, Wtd. Avg Remaining Contractual Term	7 years 3 months 18 days
Options exercisable, Wtd. Avg. Remaining Contractual Term	5 years 11 months 12 days
Options outstanding, Beginning Balance, Average Intrinsic Value	$ 232
Options outstanding, Ending Balance, Average Intrinsic Value		$ 232