CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Allowance for doubtful accounts receivable	$ 271	$ 441
Equity (deficit):
Preferred stock, par value (in dollars per shares)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	110,140,224	64,362,505
Common stock, shares outstanding (in shares)	110,140,224	64,362,505
Preferred Stock, Series D
Equity (deficit):
Preferred stock, shares issued (in shares)	1,678,772	1,791,461
Preferred stock, shares outstanding (in shares)	1,678,772	1,791,461
Preferred Stock, Series F
Equity (deficit):
Preferred stock, shares issued (in shares)	2,037,824	2,891,440
Preferred stock, shares outstanding (in shares)	2,037,824	2,891,440
Preferred Stock, Series G
Equity (deficit):
Preferred stock, shares issued (in shares)	3,172,279	4,422,623
Preferred stock, shares outstanding (in shares)	3,172,279	4,422,623
Preferred Stock, Series H
Equity (deficit):
Preferred stock, shares issued (in shares)	2,002,137	2,668,637
Preferred stock, shares outstanding (in shares)	2,002,137	2,668,637
Preferred Stock, Series I
Equity (deficit):
Preferred stock, shares issued (in shares)	1,999,575	3,391,349
Preferred stock, shares outstanding (in shares)	1,999,575	3,391,349