Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 36,943	$ 31,644
Short-term investments	996	2,671
Accounts receivable (net of allowances of $65 at June 30, 2019 and $102 at December 31, 2018)	2,142	1,757
Inventories, net	3,665	3,421
Prepaid expenses and other current assets	1,336	2,247
Total current assets	45,082	41,740
Property and equipment, net	533	605
Operating lease right-of-use assets	6,717
Goodwill	6,399	6,399
Long-term restricted investments	150	150
Other long-term assets	1,106	1,105
Total assets	59,987	49,999
Current liabilities:
Accounts payable	2,012	1,589
Accrued liabilities	4,377	4,668
Contract research liabilities	1,204	1,405
Term loan, current portion, net	972
Operating lease liabilities, current portion	2,014
Total current liabilities	10,579	7,662
Deferred revenue, non-current portion	812	812
Operating lease liabilities, non-current portion	5,143
Term loan, non-current portion, net	19,838	20,533
Other long-term liabilities	721	992
Commitments and contingencies
Stockholders’ equity:
Common stock	19	16
Additional paid-in capital	505,863	488,608
Accumulated other comprehensive loss	(7)
Accumulated deficit	(482,981)	(468,624)
Stockholders’ equity	22,894	20,000
Total liabilities and stockholders’ equity	$ 59,987	$ 49,999