Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 27,152	$ 33,891
Accounts receivable	13,198	12,716
Supplies inventory	4,557	5,324
Prepaid expenses and other current assets	2,142	1,997
Total current assets	47,049	53,928
Property and equipment, net	9,215	9,688
Finite-lived intangible assets, net	12,800	13,067
Goodwill	1,057	1,057
Restricted cash	603	603
Other assets	466	326
Total assets	71,190	78,669
Current liabilities:
Accounts payable	3,356	3,853
Accrued liabilities	8,483	8,175
Total current liabilities	11,839	12,028
Long-term debt	25,016	24,938
Capital lease liability, net of current portion	233	308
Deferred rent, net of current portion	4,094	4,170
Total liabilities	41,182	41,444
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding as of March 31, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value; 125,000,000 shares authorized, 34,326,808 and 34,210,388 shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively	34	34
Additional paid-in capital	250,238	248,278
Accumulated deficit	(220,264)	(211,087)
Total stockholders’ equity	30,008	37,225
Total liabilities and stockholders’ equity	$ 71,190	$ 78,669