Condensed Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 23,758	$ 33,891
Accounts receivable	13,006	12,716
Supplies inventory	3,049	5,324
Prepaid expenses and other current assets	1,822	1,997
Total current assets	41,635	53,928
Property and equipment, net	9,035	9,688
Finite-lived intangible assets, net	12,533	13,067
Goodwill	1,057	1,057
Restricted cash	603	603
Other assets	598	326
Total assets	65,461	78,669
Current liabilities:
Accounts payable	1,962	3,853
Accrued liabilities	8,429	8,175
Total current liabilities	10,391	12,028
Long-term debt	25,103	24,938
Capital lease liability, net of current portion	156	308
Deferred rent, net of current portion	4,005	4,170
Total liabilities	39,655	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 June 30, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value; 125,000,000 shares authorized, 34,441,714 and 34,210,388 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively	34	34
Additional paid-in capital	252,284	248,278
Accumulated deficit	(226,512)	(211,087)
Total stockholders’ equity	25,806	37,225
Total liabilities and stockholders’ equity	$ 65,461	$ 78,669