CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 17,632	$ 15,872
Short-term investments	71,073	56,904
Prepaid expenses and other current assets	3,983	5,153
Total current assets	92,688	77,929
Property and equipment, net	938	1,023
Acquired intangible asset	2,258	2,258
Goodwill	881	881
Right-of-use lease assets	374	530
Other assets	1,626	1,477
Total assets	98,765	84,098
Current liabilities:
Accounts payable	7,181	5,146
Accrued expenses	8,272	8,584
Lease liabilities	271	238
Total current liabilities	15,724	13,968
Royalty purchase liability	125,751	63,369
Lease liabilities, net of current portion	110	296
Deferred tax liability	273	273
Other liabilities	74	74
Total liabilities	141,932	77,980
Stockholders’ equity (deficit):
Preferred stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding
Common stock, $0.001 par value: 200,000,000 shares authorized; 26,438,767 and 24,976,142 shares issued and outstanding at September 30, 2021 and December 31, 2020	26	25
Additional paid-in capital	256,104	241,649
Accumulated other comprehensive income (loss)	(2)	12
Accumulated deficit	(299,295)	(235,568)
Total stockholders’ equity (deficit)	(43,167)	6,118
Total liabilities and stockholders’ equity (deficit)	$ 98,765	$ 84,098