Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 156,720	$ 226,783
Accounts receivable	11,769	16,817
Inventory, net of allowance of $2,286 and $1,363, respectively	46,641	55,031
Deposits on purchased inventory	2,084	6,457
Deferred cost of revenue	1,954	3,466
Prepaid expenses and other current assets	5,257	3,310
Total current assets	224,425	311,864
Property and equipment, net	24,062	23,399
Restricted cash	1,460	1,404
Intangible assets, net	50	55
Right-of-use assets	10,129	11,720
Other assets	1,426	1,577
TOTAL ASSETS	261,552	350,019
Current liabilities:
Accounts payable	9,984	13,739
Accrued liabilities	19,281	21,390
Customer deposits	15,463	9,662
Operating lease liability, current	2,089	2,264
Current portion of long-term debt	0	1,556
Deferred revenue, current portion	10,094	10,457
Total current liabilities	56,911	59,068
Deferred revenue, net of current portion	2,572	3,553
Long-term debt	56,940	53,995
Warrant liability	4,864	5,373
Operating lease liability, noncurrent	9,043	10,479
Other long-term liabilities	956	1,377
TOTAL LIABILITIES	131,286	133,845
Commitments and contingencies (Note 6)	0	0
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized at December 31, 2020 and 2019; no shares issued and outstanding at December 31, 2020 and 2019	0	0
Common stock, par value of $0.01 per share; 300,000,000 shares authorized at December 31, 2020 and 2019; 148,615,351 and 147,191,695 shares issued and outstanding at December 31, 2020 and 2019	1,476	1,462
Additional paid-in capital	755,874	733,888
Accumulated deficit	(627,084)	(519,176)
TOTAL STOCKHOLDERS’ EQUITY	130,266	216,174
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 261,552	$ 350,019