Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net loss	$ (2,568)	$ (2,427)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,621	1,918
Proceeds from insurance settlement		(141)
Revaluation of warrant liabilities	149	117
Stock-based compensation expense	2,746	1,094
Changes in operating assets and liabilities:
Accounts receivable, net	(1,539)	(2,431)
Prepaid expenses and other assets	(2,153)	407
Accounts payable	999	(235)
Accrued liabilities and other long term liabilities	414	(1,102)
Accrued compensation	503	1,546
Deferred revenue	(614)	(286)
Net cash provided by (used in) operating activities	558	(1,540)
Cash flows from investing activities
Purchases of property and equipment	(4,003)	(2,323)
Proceeds from insurance settlement		141
Net cash used in investing activities	(4,003)	(2,182)
Cash flows from financing activities
Proceeds from bank borrowings	6,600	6,000
Principal payments on bank borrowings	(3,373)	(4,498)
Proceeds from issuance of common stock upon exercise of stock options	1,241	282
Principal payments on capital lease obligations	(660)	(324)
Deferred offering costs	(1,242)
Repurchase of common stock	(473)
Net cash provided by financing activities	2,093	1,460
Net decrease in cash and cash equivalents	(1,352)	(2,262)
Cash and cash equivalents—beginning of period	8,134	7,963
Cash and cash equivalents—end of period	6,782	5,701
Supplemental disclosures of cash flow information:
Cash paid for interest	454	453
Cash paid for income taxes	704	639
Supplemental disclosures of non-cash investing and financing information:
Property and equipment financed through capital lease	1,804	863
Property and equipment purchased but not paid at period-end	106	181
Issuance of convertible preferred stock upon exercise of warrants		13
Unpaid deferred offering costs	$ 2,544