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Balance Sheet Parentheticals - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Restricted investments | $ 0 | $ 430
Allowance for doubtful accounts receivable | 4 | 35
Accumulated depreciation and amortization, property and equipment | $ 59,428 | $ 36,274
Preferred stock, par value per share | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 5,000 | 5,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value per share | $ 0.001 | $ 0.001
Common stock, shares authorized | 225,000 | 128,571
Treasury stock, shares | 237 | 183
Common Stock |  |
Common stock, shares issued | 103,860 | 103,663

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