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
	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