Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 95,938	$ 136,793
Accounts receivable	3,239	830
Accounts receivable - related parties	7,140	6,267
Inventory, net	16,929	10,231
Prepaid expenses and other current assets	4,512	3,985
Total current assets	127,758	158,106
Deposits and other assets	3,042	117
Property and equipment, net	2,001	1,750
Total assets	132,801	159,973
Current liabilities:
Accounts payable	4,285	4,407
Accrued expenses and other current liabilities	18,636	13,851
Deferred revenue		628
Term Loans, net of discount	43,434	10,000
Total current liabilities	126,708	28,886
Term Loans, net of discount and current portion		4,783
Other liabilities	2,278	1,849
Total liabilities	141,450	88,712
Commitments and contingencies
Stockholders' equity (deficit):
Common stock, $0.001 par value per share; 450,000,000 shares authorized; 203,452,812 and 176,918,381 shares issued and outstanding as of December 31, 2019 and 2018	203	177
Additional paid-in capital	464,491	428,878
Accumulated deficit	(473,343)	(357,794)
Total stockholders' (deficit) equity	(8,649)	71,261
Total liabilities and stockholders’ equity (deficit)	132,801	159,973
2023 Notes
Current liabilities:
Notes, net of discount	12,464	$ 53,194
2025 Notes
Current liabilities:
Term Loans, net of discount	$ 60,353