Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net loss	$ (4,806)	$ (6,986)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	463	779
Amortization of debt discounts and financing issuance costs	382
Change in fair value of warrant liability	(147)
Change in carrying value of contingent liability		(657)
Provision for doubtful accounts and other adjustments to accounts receivable	74
Provision for excess and obsolete inventory		4
(Gain) loss on disposal of fixed assets	(6)	18
Stock based compensation	834	765
Change in operating accounts:
Accounts receivable	177	2,800
Income tax receivable		98
Inventories	(1)	11
Prepaid expenses and other assets	(34)	(212)
Accounts payable and accrued liabilities	(1,253)	(460)
Deferred revenue	470	143
Net cash used in operating activities	(3,847)	(3,697)
Investing activities:
Acquisition of Birdstep Technology, net of cash received		(1,927)
Capital expenditures	(63)	(152)
Proceeds from the sale of short-term investments		3,360
Net cash (used in) provided by investing activities	(63)	1,281
Financing activities:
Cash received from stock sale for employee stock purchase plan	2	7
Cash received from stock offering, net of expenses	2,056
Cash received from related-party notes payable	2,000
Net cash provided by financing activities	4,058	7
Net increase (decrease) in cash and cash equivalents	148	(2,409)
Cash and cash equivalents, beginning of period	2,229	8,819
Cash and cash equivalents, end of period	2,377	6,410
Supplemental disclosures of cash flow information:
Cash paid for income taxes	5	$ 32
Cash paid for interest expense	331
Non-cash investing and financing activities:
Issuance of common stock warrants in connection with stock offering	$ 64