Commitments and Contingencies - Additional Information (Detail)		12 Months Ended
	Jun. 29, 2016 USD ($) ft²	Dec. 31, 2016 USD ($) Installment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments And Contingencies [Line Items]
Lease annual base rent		$ 1,500,000	$ 1,600,000	$ 1,200,000
Leasehold improvement costs capitalized		700,000
Silicon Valley Bank Credit Facility [Member] | Revolving Credit Facility [Member]
Commitments And Contingencies [Line Items]
Letters of credit outstanding		$ 2,700,000	2,700,000
Landlord [Member] | New Lease Agreement [Member]
Commitments And Contingencies [Line Items]
Number of square feet for lease | ft²	51,650
Lease end date	Dec. 31, 2026
Lease commence date	Jan. 01, 2017
Lease annual base rent	$ 408,000
Lease increased percentage	3.00%
Lease extended term	3 years
Amount receivables as an aid to construction of improvements of the leased premise	$ 1,200,000
BASF [Member] | Supply and Joint Development Agreement [Member]
Commitments And Contingencies [Line Items]
Supply agreement termination date		Dec. 31, 2027
Non-interest bearing prepayment, aggregate amount		$ 22,000,000
Number of quarterly installments | Installment		8
Maximum [Member] | BASF [Member] | Supply and Joint Development Agreement [Member]
Commitments And Contingencies [Line Items]
Credit limit percentage on prepayment balance		25.30%
Computer Equipment and Vehicles [Member]
Commitments And Contingencies [Line Items]
Recorded balance of capital lease obligations		$ 100,000
Computer Equipment and Vehicles [Member] | Maximum [Member]
Commitments And Contingencies [Line Items]
Recorded balance of capital lease obligations			$ 100,000
Plant Two [Member] | Minimum [Member] | BASF [Member] | Supply and Joint Development Agreement [Member] | Third Party Lender [Member]
Commitments And Contingencies [Line Items]
Secured debt, commitment		$ 30,000,000