Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 218,348	$ 156,720
Accounts receivable	21,659	11,769
Inventory, net of allowance of $3,071 and $2,286, respectively	29,617	46,641
Deposits on purchased inventory	4,778	2,084
Deferred cost of revenue	3,342	1,954
Prepaid expenses and other current assets	5,803	5,257
Total current assets	283,547	224,425
Property and equipment, net	20,242	24,062
Restricted cash	1,460	1,460
Intangible assets, net	44	50
Right-of-use assets	9,661	10,129
Other assets	6,853	1,426
TOTAL ASSETS	321,807	261,552
Current liabilities:
Accounts payable	9,199	9,984
Accrued liabilities	26,555	19,281
Customer deposits	20,784	15,463
Operating lease liability, current	2,561	2,089
Current portion of long-term debt	3,222	0
Deferred revenue, current portion	13,920	10,094
Total current liabilities	76,241	56,911
Deferred revenue, net of current portion	4,232	2,572
Long-term debt	54,031	56,940
Warrant liability	6,795	4,864
Operating lease liability, noncurrent	8,066	9,043
Other long-term liabilities	2,647	956
TOTAL LIABILITIES	152,012	131,286
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized at December 31, 2021 and 2020; no shares issued and outstanding at December 31, 2021 and 2020	0	0
Common stock, par value of $0.01 per share; 300,000,000 shares authorized at December 31, 2021 and 2020; 179,206,456 and 148,615,351 shares issued and outstanding at December 31, 2021 and 2020	1,782	1,476
Additional paid-in capital	905,145	755,874
Accumulated deficit	(737,132)	(627,084)
TOTAL STOCKHOLDERS’ EQUITY	169,795	130,266
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 321,807	$ 261,552