Significant Accounting Policies and Recent Accounting Pronouncements - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017 USD ($) shares		Jun. 30, 2016 shares	Jun. 30, 2017 USD ($) Segment shares		Jun. 30, 2016 USD ($) shares	Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | Segment				1
Proceeds from sales of common stock, net of offering costs						$ 37,500
Proceeds from exercise of options and purchase of stock under the Employee Stock Purchase Program				$ 4,086		2,181
Product revenue related reserves	$ 1,864			1,864			$ 305
Other	3,848			3,848			3,272
Scenario, Previously Reported [Member]
Summary Of Significant Accounting Policies [Line Items]
Proceeds from exercise of options, purchase of stock under the Employee Stock Purchase Program and sales of common stock						39,700
Other							$ 3,600
Restatement Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Proceeds from sales of common stock, net of offering costs						37,500
Proceeds from exercise of options and purchase of stock under the Employee Stock Purchase Program						$ 2,200
Product revenue related reserves	$ 300			$ 300
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock options granted | shares	3,579,467	[1]	7,600	4,456,959	[1]	1,213,376
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				55.00%
Product Revenues [Member] | Customer Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage				29.00%
Product Revenues [Member] | Customer Three [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage				16.00%
Accounts Receivable | Customer One [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage				58.00%
Accounts Receivable | Customer Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage				30.00%
Accounts Receivable | Customer Three [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk percentage				12.00%
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				45 days

[1] 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 279,467 service-based options which have a weighted average grant date fair value of $15.49 have a four-year vesting schedule with 25% vest on the first anniversary and 1/48 monthly thereafter.