CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Allowance for doubtful accounts receivable	$ 465	$ 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)	22,320,857	6,436,250
Common stock, shares outstanding (in shares)	22,320,857	6,436,250
Preferred Stock, Series D
Equity (deficit):
Preferred stock, shares issued (in shares)	1,316,231	1,791,461
Preferred stock, shares outstanding (in shares)	1,316,231	1,791,461
Preferred Stock, Series F
Equity (deficit):
Preferred stock, shares issued (in shares)	1,470,944	2,891,440
Preferred stock, shares outstanding (in shares)	1,470,944	2,891,440
Preferred Stock, Series G
Equity (deficit):
Preferred stock, shares issued (in shares)	1,909,670	4,422,623
Preferred stock, shares outstanding (in shares)	1,909,670	4,422,623
Preferred Stock, Series H
Equity (deficit):
Preferred stock, shares issued (in shares)	1,457,815	2,668,637
Preferred stock, shares outstanding (in shares)	1,457,815	2,668,637
Preferred Stock, Series I
Equity (deficit):
Preferred stock, shares issued (in shares)	1,392,123	3,391,349
Preferred stock, shares outstanding (in shares)	1,392,123	3,391,349