Mezzanine and Stockholders' Equity - Summary of Warrant (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Shares
Warrants outstanding, beginning balance (in shares)	3,154,590
Warrants granted (in shares)	0
Warrants exercised (in shares)	(51,601)
Warrants expired/forfeited (in shares)	0
Warrants outstanding, ending balance (in shares)	3,102,989	3,154,590
Weighted Average Exercise Price
Warrants outstanding, beginning balance (in dollars per share)	$ 9.96
Warrants granted (in dollars per share)	0.00
Warrants exercised (in dollars per share)	9.50
Warrants expired/forfeited (in dollars per share)	0.00
Warrants outstanding, ending balance (in dollars per share)	$ 9.97	$ 9.96
Weighted Average Remaining Contractual Term (Years)
Warrants outstanding	1 year 9 months 11 days	2 years 4 days
Aggregate Intrinsic Value (in thousands)
Warrants outstanding, beginning balance	$ 26,700
Warrants granted	0
Warrants exercised	400
Warrants expired/forfeited	0
Warrants outstanding, ending balance	$ 9,200	$ 26,700