Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 122,053	$ 167,432
Accounts receivable	35,475	36,867
Inventory	57,963	49,462
Deposits on purchased inventory	5,792	8,142
Deferred cost of revenue	5,591	9,736
Prepaid expenses and other current assets	5,153	6,045
Total current assets	232,027	277,684
Property and equipment, net	21,975	13,958
Restricted cash	1,442	1,933
Right-of-use assets	12,780	0
Other assets	1,717	1,395
TOTAL ASSETS	269,941	294,970
Current liabilities:
Accounts payable	19,241	10,207
Accrued liabilities	18,910	9,983
Customer deposits	9,559	19,968
Operating lease liability, current	1,979	0
Deferred revenue, current	8,232	13,731
Total current liabilities	57,921	53,889
Deferred revenue, net of current portion	4,913	5,744
Long-term debt	55,445	55,364
Warrant liabilities	16,675	11,844
Operating lease liability, noncurrent	11,639	0
Other long-term liabilities	431	820
TOTAL LIABILITIES	147,024	127,661
Commitments and contingencies (Note 6)	0	0
Stockholders’ equity:
Convertible preferred stock, par value of $0.01 per share; 10,000,000 shares authorized at June 30, 2019 and December 31, 2018; no shares issued and outstanding at June 30, 2019 and December 31, 2018	0	0
Common stock, par value of $0.01 per share; 300,000,000 shares authorized at June 30, 2019 and December 31, 2018; 98,259,203 and 96,332,023 shares issued and outstanding at June 30, 2019 and December 31, 2018	973	952
Additional paid-in capital	585,080	565,334
Accumulated deficit	(463,136)	(398,977)
TOTAL STOCKHOLDERS’ EQUITY	122,917	167,309
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 269,941	$ 294,970