Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 9,506	$ 1,948
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,177	918
Deferred taxes	(22)	(50)
Stock-based compensation expense	1,075	838
Provision for excess and obsolete inventory	578	549
Changes in operating assets & liabilities:
Accounts receivable	(16,178)	(10,287)
Inventories	(844)	1,143
Prepaid expenses and other current assets	(2,347)	(1,214)
Accounts payable and other current liabilities	3,049	1,082
Deferred revenue	2,085	226
Income taxes	2	30
Other assets and liabilities	(749)	(5,364)
Net cash used in operating activities	(2,668)	(10,181)
Cash flows from investing activities
Expenditures for property, plant and equipment	(1,116)	(1,275)
Net cash used in investing activities	(1,116)	(1,275)
Cash flows from financing activities
Net settlement on restricted stock grants	(286)	(2)
Proceeds from exercise of stock options	2,531	194
Net cash provided by financing activities	2,245	192
Effect of exchange rate changes on cash and cash equivalents	105	(127)
Net decrease in cash, cash equivalents and restricted cash	(1,434)	(11,391)
Cash, cash equivalents and restricted cash at beginning of period	77,655	85,825
Cash, cash equivalents and restricted cash at end of period	$ 76,221	$ 74,434