Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 24,446	$ 16,123
Short-term investments	11,237	24,397
Restricted cash, current	132	132
Prepaid expenses and other current assets	2,273	1,650
Total current assets	38,088	42,302
Restricted cash, noncurrent	254	254
Property and equipment, net	1,669	1,552
Operating lease, right-of-use asset	9,838	9,985
Total assets	49,849	54,093
Current liabilities:
Accounts payable	468	1,543
Accrued liabilities	2,551	5,285
Deferred revenue	344	1,435
Current portion of long-term debt	1,742	418
Total current liabilities	5,105	8,681
Operating lease liability, noncurrent	11,716	11,429
Long-term debt	8,169	4,509
Total liabilities	24,990	24,619
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value per share; 200,000,000 shares authorized at March 31, 2020 and December 31, 2019; 18,638,359 shares issued and 18,587,892 shares outstanding at March 31, 2020; 18,638,359 shares issued and 18,587,892 shares outstanding at December 31, 2019	19	19
Treasury stock, at cost; 50,467 shares at March 31, 2020 and December 31, 2019	0	0
Additional paid-in capital	118,417	117,371
Accumulated other comprehensive gain (loss)	(118)	10
Accumulated deficit	(93,459)	(87,926)
Total stockholders’ equity	24,859	29,474
Total liabilities and stockholders’ equity	$ 49,849	$ 54,093