CONDENSED CONSOLIDATED STATEMENTS OF PREFERRED SHARES AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Series Seed Preferred Shares	Series A Preferred Shares	Series B Preferred Shares	Common shares	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Total
Balance at beginning of period at Dec. 31, 2018					$ 1,633	$ (54,185)		$ (52,552)
Balance at beginning of period ( in shares) at Dec. 31, 2018				1,832,923
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense					499			499
Vesting of restricted shares (in shares)				99,911
Unrealized holding gains on marketable securities							$ 25	25
Net loss						(5,200)		(5,200)
Balance at end of period at Mar. 31, 2019					2,132	(59,385)	25	(57,228)
Balance at end of period ( in shares) at Mar. 31, 2019				1,932,834
Balance at beginning of period at Dec. 31, 2018	$ 8,658	$ 51,320	$ 79,831
Balance at beginning of period ( in shares) at Dec. 31, 2018	2,045,556	8,411,368	10,553,483
Balance at end of period at Mar. 31, 2019	$ 8,658	$ 51,320	$ 79,831
Balance at end of period ( in shares) at Mar. 31, 2019	2,045,556	8,411,368	10,553,483
Balance at beginning of period at Dec. 31, 2019				$ 3	238,384	(97,513)	44	140,918
Balance at beginning of period ( in shares) at Dec. 31, 2019				30,110,251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation expense					2,544			2,544
Vesting of restricted shares (in shares)				84,247
Issuance of common shares upon stock option exercise					167			$ 167
Issuance of common shares upon stock option exercise (in shares)				35,822				35,822
Issuance of common stock under the Employee Stock Purchase Plan					681			$ 681
Issuance of common stock under the Employee Stock Purchase Plan (in shares)				53,405
Unrealized holding gains on marketable securities							571	571
Net loss						(16,746)		(16,746)
Balance at end of period at Mar. 31, 2020				$ 3	$ 241,776	$ (114,259)	$ 615	$ 128,135
Balance at end of period ( in shares) at Mar. 31, 2020				30,283,725