Consolidated Statement of Stockholders Equity, , Series A and Series B Convertible Preferred Stock - USD ($) shares in Thousands, $ in Thousands	Series A Convertible Preferred stock	Series B Convertible Preferred stock	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
Balance at the beginning of the period at Dec. 31, 2016			$ 10		$ 88,406	$ (20,291)	$ (27)	$ 68,098
Balance at the beginning of the period (in shares) at Dec. 31, 2016			95,680
Increase (decrease) in equity
Pre-merger equity issuance					20,100			20,100
Pre-merger equity issuance (in shares)			2,810
Reverse recapitalization			$ 1		26,773			26,774
Reverse recapitalization (in shares)			6,759
Issuance of stock					10,000			10,000
Issuance of stock (in shares)			1,026
Equity issuance costs					(6,295)			(6,295)
Share-based compensation					19,754			19,754
Other comprehensive loss							(13)	(13)
Net loss						(35,326)		(35,326)
Balance at the end of the period at Dec. 31, 2017			$ 11	$ 0	158,738	(55,617)	(40)	103,092
Balance at the end of the period (in shares) at Dec. 31, 2017			106,275	0
Balance at the end of the period at Dec. 31, 2017	$ 0	$ 0
Increase (decrease) in equity
Issuance of stock					4,638			4,638
Issuance of stock (in shares)			414
Share-based compensation					19,032			19,032
Restricted stock vesting			173
Shares repurchased related to share-based compensation				$ (35)				(35)
Shares repurchased related to share-based compensation (in shares)			(6)	(6)
Issuance of preferred stock - temporary equity	38,549	26,159
Preferred stock dividends					(724)			(724)
Deemed dividends - accretion of beneficial conversion feature					(822)			(822)
Preferred stock dividends	720
Deemed dividends - accretion of beneficial conversion feature - temporary equity	822
Net loss						(41,960)		(41,960)
Balance at the end of the period at Dec. 31, 2018			$ 11	$ (35)	$ 180,862	(97,617)	0	$ 83,221
Balance at the end of the period (in shares) at Dec. 31, 2018			106,856	6
Balance at the end of the period at Dec. 31, 2018	$ 40,091	$ 26,159
Increase (decrease) in equity
Adoption of ASU 2016-01						$ (40)	$ 40