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Selected Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  | $ 1,436 | $ 2,166 | $ 3,382 | $ 2,750 |  |  |  |  |
Gross profit on net revenue |  |  |  |  |  | 1,229 | 1,454 | 2,914 | 2,357 |  |  |  |  |
Net income (loss) | $ (8,404) | $ (5,516) | $ (6,929) | $ 5,389 | $ (16,493) | $ (19,678) | $ (18,026) | $ (15,660) | $ (10,537) | $ (20,122) | $ (11,104) | $ (23,549) | $ (63,902) | $ (36,606)
Net income (loss) per share, basic and diluted | $ (0.22) | $ (0.51) | $ (0.66) | $ 0.59 | $ (1.84) | $ (2.51) | $ (2.23) | $ (1.94) | $ (1.55) | $ (0.63) | $ (0.30) |  |  |

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