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Quarterly Financial Results (unaudited) - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 3,604 | $ 15,710 | $ 8,951 | $ 22,357 | $ 13,202 | $ 12,885 | $ 14,895 | $ 21,757 | $ 50,622 | $ 62,739 | $ 16,923
Cost of revenues, exclusive of operating expenses shown below | 3,478 | 13,259 | 5,769 | 17,311 | 7,224 | 10,610 | 14,003 | 15,715 |  |  |
Other operating expenses | 5,388 | 5,364 | 7,794 | 8,357 | 13,113 | 12,264 | 18,670 | 12,940 |  |  |
Operating loss | (5,262) | (2,913) | (4,612) | (3,311) | (7,135) | (9,989) | (17,778) | (6,898) | (16,098) | (41,800) | (41,814)
Earnings from equity method investments | 15,518 | 10,735 | 13,754 | 5,577 | 3,788 | (41) | 4,860 | 314 | 45,584 | 8,921 | 42,712
Royalties, related party | 2,203 | 2,064 | 669 | 1,189 | 2,876 | 3,273 | 2,299 | 2,194 | 6,125 | 10,642 | 6,410
Other income (expenses), net | 1,698 | 309 | (1,852) | 974 | (2,568) | (1,853) | (1,765) | (1,698) |  |  |
Income (loss) before income tax expense | 14,157 | 10,195 | 7,959 | 4,429 | (3,039) | (8,610) | (12,384) | (6,088) | 36,740 | (30,121) | 1,683
Income tax (benefit) expense | (61,673) | 583 | 99 | 53 | (131) | 44 | 63 | 44 | (60,938) | 20 | 296
Net income (loss) | $ 75,830 | $ 9,612 | $ 7,860 | $ 4,376 | $ (2,908) | $ (8,654) | $ (12,447) | $ (6,132) | $ 97,678 | $ (30,141) | $ 1,387
Net income (loss) per common share – basic (in dollars per share) | $ 3.45 | $ 0.44 | $ 0.36 | $ 0.20 | $ (0.13) | $ (0.40) | $ (0.57) | $ (0.28) | $ 4.40 | $ (1.37) | $ 0.06
Net income (loss) per common share – diluted (in dollars per share) | $ 3.39 | $ 0.43 | $ 0.35 | $ 0.20 | $ (0.13) | $ (0.40) | $ (0.57) | $ (0.28) | $ 4.34 | $ (1.37) | $ 0.06
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 21,693 | 21,740 | 21,875 | 21,849 | 21,676 | 21,687 | 21,715 | 21,696 | 21,931 | 21,773 | 21,554
Diluted (in shares) | 22,061 | 22,098 | 22,187 | 22,177 | 21,676 | 21,687 | 21,715 | 21,696 | 22,234 | 21,773 | 22,079
Reduction to royalty award accrual | $ 4,000 |  |  |  |  |  |  |  | $ 4,000 |  |
Valuation allowance adjustments | $ (61,400) |  |  |  |  |  |  |  |  |  |

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