Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 233,587	$ 114,634
Accounts receivable, net	8,517
Inventories	3,820
Other current assets	3,445	7,729
Total current assets	249,369	122,363
Property and equipment, net	1,919	1,825
Operating lease right-of-use assets	3,398	4,569
Other assets	4,793	3,290
TOTAL ASSETS	259,479	132,047
LIABILITIES
Accounts payable	6,803	9,372
Accrued liabilities	12,169	8,197
Operating lease liabilities, current portion	2,014	1,966
Total current liabilities	20,986	19,535
Accrued milestone and royalty payments	2,250	2,695
Operating lease liabilities, long-term portion	988	2,013
Other liabilities	939	1,968
TOTAL LIABILITIES	25,163	26,211
Commitments and contingencies (Note 8)
STOCKHOLDERS' EQUITY
Preferred stock, $0.0001 par value, 5,500,000 shares authorized at June 30, 2021 and December 31, 2020; none issued at June 30, 2021 and December 31, 2020
Common stock, $0.0001 par value, 100,000,000 shares authorized at June 30, 2021 and December 31, 2020; 43,576,950 and 40,688,447 shares issued at June 30, 2021 and December 31, 2020, respectively	4	4
Additional paid in capital	509,049	391,558
Accumulated other comprehensive loss	(13)	(526)
Accumulated deficit	(274,724)	(285,200)
TOTAL STOCKHOLDERS' EQUITY	234,316	105,836
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 259,479	$ 132,047