Stockholders' Equity - Warrants to Purchase Common Stock (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Class of Warrant or Right [Line Items]
Outstanding and exercisable at the beginning	0	1,612
Exercised		(1,612)
Granted	39
Outstanding and exercisable at the end	39	0
Weighted-Average Outstanding, beginning	$ 0.00
Granted (in dollars per share)	6.80
Weighted-Average Outstanding, end	6.80	$ 0.00
Minimum [Member]
Class of Warrant or Right [Line Items]
Weighted-Average Outstanding, beginning		1.50
Exercised (in dollars per share)		1.50
Maximum [Member]
Class of Warrant or Right [Line Items]
Weighted-Average Outstanding, beginning		3.00
Exercised (in dollars per share)		3.00
Weighted Average [Member]
Class of Warrant or Right [Line Items]
Weighted-Average Outstanding, beginning	0.00	1.56
Exercised (in dollars per share)		1.56
Granted (in dollars per share)	6.80
Weighted-Average Outstanding, end	$ 6.80	$ 0.00