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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income (loss) $ 425 $ (67)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,140 1,178
Amortization of marketable securities premium 27 38
Impairment charge on equity investee 313  
Stock-based compensation 312 253
Realized gain on sale of available for sale securities (77) (181)
Loss from equity method investments, net 620 456
Changes in operating assets and liabilities:    
Accounts receivable (3,156) (1,223)
Inventories 1,065 (756)
Prepaid expenses and other current assets 318 (281)
Other assets 246 114
Accounts payable 1,424 1,557
Accrued liabilities [1] (1,373) (1,051)
Other long-term liabilities, including royalties (211) (148)
Net cash provided by (used in) operating activities 1,073 (111)
Cash flows from investing activities:    
Purchases of equipment (268) (795)
Purchases of available for sale securities (21,716) (4,138)
Proceeds from sales and maturities of available-for-sale securities 8,970 5,170
Net cash provided by (used in) investing activities (13,014) 237
Cash flows from financing activities:    
Proceeds from issuance of common stock and options exercised, net of issuance costs 32,675  
Dividends paid by joint ventures to their minority share holders (465) (39)
Net cash provided by (used in) financing activities 32,210 (39)
Effect of exchange rate changes on cash and cash equivalents 91 105
Net increase in cash and cash equivalents 20,360 192
Cash and cash equivalents at the beginning of the period 36,152 24,875
Cash and cash equivalents at the end of the period $ 56,512 $ 25,067
[1] * Dividend accrued but not paid by joint ventures of $503 and $552 was included in accrued liabilities as of March 31, 2017 and March 31, 2016, respectively.