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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)

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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