Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (2,535)	$ 1,132	$ 2,033
Adjustments to reconcile net income (loss) to net cash provided by operating activities, net of business acquisition:
Impact of tax valuation allowance	(2,066)
Depreciation	6,730	5,345	4,189
Amortization of intangibles	412	295	223
Amortization of debt issue costs		66	49
Stock based compensation – options and restricted stock	2,889	641	666
Stock based compensation – warrants	590	51	263
Provision for bad debts	2,318	2,437	2,797
Changes in assets and liabilities, net of business acquisition:
(Increase) in accounts receivable, net of write-offs	(3,215)	(2,770)	(7,416)
(Increase) in inventories	(896)	(229)	(442)
Decrease (increase) in other assets	11	41	(71)
(Increase) in other current assets	(3,748)	(25)	(932)
Increase in accounts payable and other liabilities	5,903	2,466	868
Net cash provided by operating activities	6,393	9,450	2,227
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition, net of cash acquired of $890 and $79	(72,940)	(5,830)
Purchases of property and equipment	(2,215)	(3,772)	(2,011)
Net cash used in investing activities	(75,155)	(9,602)	(2,011)
CASH FLOWS FROM FINANCING ACTIVITIES
Advances from (repayments to) revolving credit facility	10,002	(4,282)	(4,177)
Repayment of capital lease obligations	(4,115)	(3,581)	(2,606)
Proceeds from term loan	55,022
Payments of debt issue costs	(3,351)
Issuance of common stock for the exercise of options, warrants and ESPP shares, net of transaction expenses	935	2,616	515
Issuance of common stock for cash , net of transaction expenses		34,254	9,018
Net cash provided by financing activities	58,493	29,007	2,750
Net change in cash and cash equivalents	(10,269)	28,855	2,966
Cash and cash equivalent, beginning of year	33,689	4,834	1,868
Cash and cash equivalents, end of year	23,420	33,689	4,834
Supplemental disclosure of cash flow information:
Interest paid	911	981	945
Income taxes paid	25	177	17
Supplemental disclosure of non-cash investing and financing information:
Equipment acquired under capital lease/loan obligations	4,813	$ 5,884	$ 3,377
Fair value of common stock issued to fund acquisition	102,510
Fair value of preferred stock issued to fund acquisition	$ 73,200