Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 91,436	$ 69,886
Restricted cash	567	567
Marketable securities	23,280	91,015
Accounts receivable, net	20,310	23,289
Inventory	9,174	5,323
Prepaid expenses	13,279	12,131
Other current assets	22,502	846
Total current assets	180,548	203,057
Property and equipment, net	796	2,293
Intangible assets	5,785	6,583
Right of use assets - operating leases	3,933	6,704
Other assets	520	514
Total assets	191,582	219,151
Current liabilities:
Accounts payable	9,925	6,030
Accrued expenses and other current liabilities	59,758	53,030
Deferred revenue	1,000	0
Operating lease liability, current	2,490	2,198
Total current liabilities	73,173	61,258
Convertible notes payable	213,645	195,591
Term loan	24,905	0
Operating lease liability, long term	3,518	4,581
Total liabilities	315,241	261,430
Commitments and contingencies
Stockholders’ equity (deficit):
Common stock, $0.0001 par value; 200,000,000 shares authorized, 46,779,479 shares and 46,189,870 shares issued and outstanding at December 31, 2020 and 2019, respectively	5	5
Additional paid-in-capital	1,222,137	1,194,327
Accumulated other comprehensive income (loss)	21	3
Accumulated deficit	(1,345,822)	(1,236,614)
Total stockholders’ equity (deficit)	(123,659)	(42,279)
Total liabilities and stockholders’ equity (deficit)	$ 191,582	$ 219,151