Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 69,886	$ 59,321
Restricted cash	567	560
Marketable securities	91,015	177,140
Accounts receivable, net	23,289	16,758
Inventory	5,323	6,210
Prepaid expenses	12,131	13,842
Other current assets	846	1,202
Total current assets	203,057	275,033
Property and equipment, net	2,293	4,003
Intangible assets	6,583	7,382
Right of use assets - operating leases	6,704
Other assets	514	544
Total assets	219,151	286,962
Current liabilities:
Accounts payable	6,030	4,226
Accrued expenses and other current liabilities	53,030	42,203
Operating lease liability, current	2,198
Total current liabilities	61,258	46,429
Notes payable	195,591	179,806
Other non-current liabilities	0	95
Operating lease liability, long term	4,581
Total liabilities	261,430	226,330
Commitments and contingencies
Stockholders’ equity (deficit):
Common stock, $.0001 par value; 200,000,000 shares authorized, 46,189,870 shares and 45,563,693 shares issued and outstanding at December 31, 2019 and 2018, respectively	5	5
Additional paid-in-capital	1,194,327	1,165,003
Accumulated other comprehensive income (loss)	3	(755)
Accumulated deficit	(1,236,614)	(1,103,621)
Total stockholders’ equity (deficit)	(42,279)	60,632
Total liabilities and stockholders’ equity (deficit)	$ 219,151	$ 286,962