Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 68,041	$ 115,243
Restricted cash	115	115
Short-term investments	185,091	177,822
Prepaid expenses and other current assets	9,308	5,684
Total current assets	262,555	298,864
Property and equipment, net	166	192
Right-of-use asset, net	338	290
Other assets		1,267
Total assets	263,059	300,613
Current liabilities:
Accounts payable	3,624	3,508
Accrued expenses and other current liabilities	11,724	11,246
Current portion of deferred revenue	1,517	1,517
Current portion of right-of-use liability	397	316
Current portion of term loan	7,030	2,285
Total current liabilities	24,292	18,872
Long-term liabilities:
Deferred revenue, less current portion	10,859	11,617
Right-of-use liability, less current portion	22	101
Term loan, less current portion	13,323	17,834
Other long-term liabilities		1
Total long-term liabilities	24,204	29,553
Total liabilities	48,496	48,425
Commitments
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 shares authorized; 0 shares outstanding at June 30, 2021 and December 31, 2020
Common stock, $0.0001 par value, 100,000,000 shares authorized; 48,616,628 and 47,881,223 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	5	5
Additional paid-in capital	833,802	820,815
Accumulated other comprehensive income (loss)	17	(4)
Accumulated deficit	(619,261)	(568,628)
Total stockholders’ equity	214,563	252,188
Total liabilities and stockholders’ equity	$ 263,059	$ 300,613