Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). Also includes the amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

No definition available.

Statements of Cash Flows Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Statements of Cash Flows Statement - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Net Income (Loss) Attributable to Parent	$ 9,193	$ 7,601	$ 16,344	$ 21,540
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Amortization of Financing Costs and Discounts			0	2,039
Amortization of Intangible Assets	505	595	1,010	1,190
Depreciation			1,880	1,868
Foreign Currency Transaction Gain (Loss), before Tax	166	192	435	299
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset			132	117
Share-based Compensation			2,948	2,387
Provision for doubtful accounts and inventory valuation			2,026	2,278
Gain (Loss) Related to Litigation Settlement	0	0	0	(14,632)
Increase (Decrease) in Other Operating Assets and Liabilities, Net			5,198	(4,852)
Net Cash Provided by (Used in) Operating Activities			29,973	12,234
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Marketable Securities			(62,527)	(70,412)
Proceeds from Sale and Maturity of Marketable Securities			59,491	90,599
Payments to Acquire Property, Plant, and Equipment			(5,301)	(2,173)
Net Cash Provided by (Used in) Investing Activities			(8,337)	18,014
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for Repurchase of Warrants			(1,025)	0	$ (9,500)
Payments for Repurchase of Common Stock			0	(8,044)
Payments Related to Tax Withholding for Share-based Compensation			(1,323)	(1,565)
Proceeds from (Payments for) Other Financing Activities			(358)	(94)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options			289	275
Net Cash Provided by (Used in) Financing Activities			(2,417)	(9,428)
Effect of Exchange Rate on Cash and Cash Equivalents			627	1,065
Cash and Cash Equivalents, Period Increase (Decrease)			19,846	21,885
Cash and Cash Equivalents, at Carrying Value	$ 57,705	$ 66,439	57,705	66,439	$ 37,859	$ 44,554
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid			2,246	2,541
Interest Paid			$ 0	$ 1,125