Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 166,925	$ 156,720
Accounts receivable	15,416	11,769
Inventory, net of allowance of $2,181 and $2,286, respectively	41,878	46,641
Deposits on purchased inventory	3,679	2,084
Deferred cost of revenue	1,199	1,954
Prepaid expenses and other current assets	5,101	5,257
Total current assets	234,198	224,425
Property and equipment, net	21,754	24,062
Restricted cash	1,460	1,460
Intangible assets, net	47	50
Right-of-use assets	9,018	10,129
Other assets	7,392	1,426
TOTAL ASSETS	273,869	261,552
Current liabilities:
Accounts payable	7,525	9,984
Accrued liabilities	18,304	19,281
Customer deposits	14,183	15,463
Operating lease liability, current	1,938	2,089
Deferred revenue, current	11,041	10,094
Total current liabilities	52,991	56,911
Deferred revenue, net of current portion	4,962	2,572
Long-term debt	57,101	56,940
Warrant liabilities	9,212	4,864
Operating lease liability, noncurrent	8,039	9,043
Other long-term liabilities	2,513	956
TOTAL LIABILITIES	134,818	131,286
Commitments and contingencies (Note 6)	0	0
Stockholders’ equity:
Preferred stock, par value of $0.01 per share; 10,000,000 shares authorized at June 30, 2021 and December 31, 2020; no shares issued and outstanding at June 30, 2021 and December 31, 2020	0	0
Common stock, par value of $0.01 per share; 300,000,000 shares authorized at June 30, 2021 and December 31, 2020; 163,590,744 and 148,615,351 shares issued and outstanding at June 30, 2021 and December 31, 2020	1,624	1,476
Additional paid-in capital	822,230	755,874
Accumulated deficit	(684,803)	(627,084)
TOTAL STOCKHOLDERS’ EQUITY	139,051	130,266
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 273,869	$ 261,552