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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:        
Net income (loss) $ 4,256 $ (403) $ 7,496 $ (5,095)
Loss from discontinued operations (142) (659) (318) (914)
Income (loss) from continuing operations 4,398 256 7,814 (4,181)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depreciation 79 47 181 139
Stock-based compensation     599 393
Provision for doubtful accounts receivable     17 (8)
Amortization of discounts on long-term borrowings and acquisition related liabilities     0 2,815
Amortization of loan origination fees     47 112
Loss (gain) on dispositions of property and equipment     3 (1)
Changes in operating assets and liabilities:        
Trade accounts receivable, inventories, and other assets     (5,883) (2,913)
Accounts payable, accrued liabilities, accrued federal and state income taxes, and accrued warranty reserve     22 1,967
Deferred revenue     (29) 42
Total adjustments     (5,043) 2,546
Net cash provided by (used in) operating activities     2,771 (1,635)
Cash flows from investing activities:        
Acquisitions of property and equipment     (540) (149)
Proceeds from the sale of property and equipment     0 130
Net cash used in investing activities     (540) (19)
Cash flows from financing activities:        
Proceeds from warrants exercised     2,503 0
Proceeds from issuances of common stock, net     23,576 5,952
Proceeds from exercises of stock options and employee stock purchase plan purchases     255 32
Payments on other borrowings     0 (44)
Net (repayments) proceeds on credit line borrowings     (451) 599
Net cash provided by financing activities     25,883 6,539
Net cash provided by continuing operations     28,114 4,885
Cash flows of discontinued operations:        
Operating cash flows, net     (137) (216)
Investing cash flows, net     (446) 0
Financing cash flows, net     0 136
Net cash used in discontinued operations     (583) (80)
Net increase in cash and cash equivalents     27,531 4,805
Cash and cash equivalents, beginning of period     7,435 1,890
Cash and cash equivalents, end of period 34,966 6,695 34,966 6,695
Classification of cash and cash equivalents:        
Cash and cash equivalents 34,552 6,265 34,552 6,265
Restricted cash held 114 130 114 130
Cash held in escrow 300 300 300 300
Cash and cash equivalents, end of period $ 34,966 $ 6,695 7,435 1,890
Supplemental disclosures for non-cash financing activities:        
Conversion of subordinated convertible debt to equity, net of discount amortization     $ 0 $ 3,858