Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 56,239	$ 69,886
Restricted cash	567	567
Marketable securities	69,495	91,015
Accounts receivable, net	17,899	23,289
Inventory	5,906	5,323
Prepaid expenses	7,921	12,131
Other current assets	1,838	846
Total current assets	159,865	203,057
Property and equipment, net	1,747	2,293
Intangible assets	6,184	6,583
Right of use assets - operating leases	6,787	6,704
Other assets	514	514
Total assets	175,097	219,151
Current liabilities:
Accounts payable	11,718	6,030
Accrued expenses and other current liabilities	51,756	53,030
Operating lease liability, current	2,180	2,198
Total current liabilities	65,654	61,258
Convertible notes payable	204,315	195,591
Term loan	9,940	0
Operating lease liability, long term	4,607	4,581
Total liabilities	284,516	261,430
Commitments and contingencies
Stockholders’ equity (deficit):
Common stock, 0.0001 par value; 200,000,000 shares authorized, 46,448,491 shares and 46,189,870 shares issued and outstanding at June 30, 2020 and December 31, 2019	5	5
Additional paid-in-capital	1,208,616	1,194,327
Accumulated other comprehensive income	108	3
Accumulated deficit	(1,318,148)	(1,236,614)
Total stockholders’ equity (deficit)	(109,419)	(42,279)
Total liabilities and stockholders’ equity (deficit)	$ 175,097	$ 219,151