Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net loss	$ (5,821)	$ (3,817)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,400	995
Stock-based compensation	1,625	1,365
Provision for uncollectible amounts	33
Change in fair value of warrant liability		(5)
Changes in assets and liabilities:
Receivables	(2,279)	(990)
Prepaid expenses	(574)	(1,069)
Other current assets	5	19
Other long-term assets	232
Accounts payable	(73)	536
Accrued compensation and related costs	513	(107)
Unearned revenue	(735)	(1,615)
Other current liabilities	55	(102)
Other long-term liabilities	246	213
Total Adjustments	448	(760)
Net cash used in operating activities	(5,373)	(4,577)
Cash Flows from Investing Activities:
Capital expenditures	(339)	(659)
Investment in Intangible assets	(228)	(255)
Net cash used in investing activities	(567)	(914)
Cash Flows from Financing Activities:
Proceeds from line of credit	9,200	7,000
Proceeds from term loan	6,000
Principal payments under capital lease obligations	(322)	(437)
Acquisition of treasury stock	(134)	(627)
Series B convertible preferred stock dividend	(3)
Proceeds from exercise of stock options	277	59
Fees from issuance of term loan	(60)
Proceeds employee stock purchase plan	37	51
Net cash provided by financing activities	14,995	6,046
Effect of exchange rate changes on cash and cash equivalents	(1)	(8)
Increase in cash and cash equivalents	9,054	547
Cash and cash equivalents, beginning of period	15,407	14,238
Cash and cash equivalents, end of period	24,461	14,785
Non-Cash Investing and Financing Activities:
Capital lease obligations incurred	958	581
Capital equipment purchased on credit	958	581
Change in fair value of warrants classified as liability		376
Change in fair value of intellectual property purchase liability		2,446
Supplemental Disclosures of Cash Flow Information:
Interest paid	$ 103	$ 80