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Summary of Significant Accounting Policies - Basis of Presentation and Use of Estimates (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
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Aug. 23, 2016 USD ($) shares | Aug. 04, 2016 USD ($) $ / shares | Dec. 10, 2015 USD ($) item | Aug. 31, 2016 USD ($) $ / shares | May 31, 2016 USD ($) $ / shares | Feb. 29, 2016 USD ($) $ / shares | Nov. 30, 2015 USD ($) $ / shares | Aug. 31, 2015 USD ($) $ / shares | May 31, 2015 USD ($) $ / shares | Feb. 28, 2015 USD ($) $ / shares | Nov. 30, 2014 USD ($) $ / shares | Aug. 31, 2016 USD ($) $ / shares | Aug. 31, 2015 USD ($) $ / shares | Aug. 31, 2014 USD ($) | Dec. 31, 2015 USD ($)
Losses from operations |  |  |  | $ 11,562 | $ 3,141 | $ 2,770 | $ 3,132 | $ 2,930 | $ 3,074 | $ 2,852 | $ 4,442 | $ 20,605 | $ 13,298 | $ 24,800 |
Gross losses on product sales |  |  |  | 1,249 | $ 1,450 | $ 795 | $ 1,444 | 1,037 | $ 859 | $ 651 | $ 1,543 | 4,938 | 4,090 | 11,300 |
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  |  | 3,439 | 4,525 | 15,700 |
Cash and cash equivalents |  |  |  | 6,030 |  |  |  | $ 4,808 |  |  |  | 6,030 | 4,808 | $ 12,649 |
Proceeds from issuance of common stock | $ 2,885 |  |  |  |  |  |  |  |  |  |  | 2,885 |  |  |
Newly issued shares of common stock |  |  |  |  |  |  |  |  |  |  |  | 2,885 |  |  |
Issuance of debt |  |  |  | $ 1,615 |  |  |  |  |  |  |  | 1,615 |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |
Interest rate of convertible note |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration of sale price of Taiwan headquarters building |  |  | $ 5,200 |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | item |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Receipt from initial installment of cash consideration for the sale of its headquarters building |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |
Second installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
Third installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  | 5,288 | 4,752 |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  | $ (21,304) | $ (13,318) |  |
Basic and diluted earnings per share | $ / shares |  |  |  | $ (4.07) | $ (1.11) | $ (0.87) | $ (1.14) | $ (1.03) | $ (1.10) | $ (1.02) | $ (1.52) | $ (7.25) | $ (4.62) |  |
Well Thrive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued shares of common stock (in shares) | shares | 577 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued shares of common stock | $ 2,885 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 1,615 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of convertible note | $ / shares |  | $ 3.40 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  | $ 3.40 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |

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