Significant Accounting Policies and Recent Accounting Pronouncements - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 30, 2017 shares	Sep. 30, 2017 USD ($) shares	Jun. 30, 2017 shares	Sep. 30, 2016 shares	Sep. 30, 2017 USD ($) Segment shares		Sep. 30, 2016 shares	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | Segment					1
Product revenue related reserves		$ 4,095			$ 4,095			$ 305
Other		2,917			2,917			3,272
Restatement Adjustment
Summary Of Significant Accounting Policies [Line Items]
Product revenue related reserves		$ 300			$ 300
Scenario, Previously Reported [Member]
Summary Of Significant Accounting Policies [Line Items]
Other								$ 3,600
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock options granted | shares		221,398		1,050	4,678,357	[1]	1,214,426
Stock Options [Member] | CEO [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock options granted | shares	3,300,000		3,300,000
ASU 2016-18 [Member] | Movement of Restricted Cash to Cash and Cash Equivalents [Member]
Summary Of Significant Accounting Policies [Line Items]
Effect of early adoption of Accounting standards Update (ASU)					$ 100
Product Revenues [Member] | Customer One [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage					50.00%
Product Revenues [Member] | Customer Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage					32.00%
Product Revenues [Member] | Customer Three [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage					18.00%
Accounts Receivable | Customer One [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage					66.00%
Accounts Receivable | Customer Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage					21.00%
Accounts Receivable | Customer Three [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage					13.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable payment term					30 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable payment term					60 days

[1] In June 2017, the Company granted its new CEO 3,300,000 options with service and market conditions. These options have a five-year cliff vesting schedule. The fair value of $13.48 for these options was determined by a lattice model with Monte Carlo simulations. The remaining 1,378,357  service-based options which have a weighted average grant date fair value of $16.90 have a four-year vesting schedule with 25% vesting on the first anniversary and 1/48 monthly thereafter.