Commitments and Contingencies (Details) ft² in Thousands, € in Millions, ¥ in Millions									1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 25, 2017 CNY (¥)	Oct. 25, 2017 USD ($)	Jun. 16, 2017 USD ($)	Jun. 13, 2017 USD ($) ft²	Dec. 27, 2016 USD ($)	Mar. 23, 2015 USD ($)	Mar. 23, 2015 EUR (€)	Sep. 16, 2013 USD ($)	Apr. 30, 2017 USD ($)	Sep. 30, 2016 ft²	Aug. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2010 claim defendant	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2012 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Number of defendants | defendant																		4
Operating leases, future minimum payments due												$ 32,400,000		$ 32,400,000
Operating leases, future minimum, sublease receipts												800,000		800,000
Rent expense												1,300,000	$ 600,000	$ 3,500,000	$ 1,700,000
Area of office lease | ft²				39						64
Office lease term, months				123 months										129 months
Asset Retirement Obligations, Noncurrent												4,456,000		$ 4,456,000			$ 1,155,000
Office and laboratory lease period free of charge														9 months
Asset Retirement Obligation												3,100,000		$ 3,100,000
Amount of contribution																	21,000,000
Expected costs to transfer product line											$ 100,000
Penalty payment derivative												400,000		400,000			$ 400,000
Rusnano
Commitments And Contingencies Disclosure [Line Items]
Other non-current liability												0		0
Minimum
Commitments And Contingencies Disclosure [Line Items]
Office lease, monthly rental rate				$ 41,388										144,000
Maximum
Commitments And Contingencies Disclosure [Line Items]
Office lease, monthly rental rate				$ 72,525										194,000
Embedded derivative financial instruments | Maximum
Commitments And Contingencies Disclosure [Line Items]
Other non-current liability																			$ 5,000,000
Finisar Corp
Commitments And Contingencies Disclosure [Line Items]
Pending claims | claim																		2
Lestina International Ltd. litigation
Commitments And Contingencies Disclosure [Line Items]
Damages sought, value					$ 3,000,000
Laser 2000 case
Commitments And Contingencies Disclosure [Line Items]
Payment for legal settlement									$ 250,000
Laser 2000 case | Pending litigation
Commitments And Contingencies Disclosure [Line Items]
Partial settlement of claims								$ 492,000
Accrual for estimated net litigation expense						$ 1,100,000	€ 1
Litigation liability accrued																				$ 300,000
APAT Arbitration
Commitments And Contingencies Disclosure [Line Items]
Damages sought, value			$ 1,500,000
Indemnification agreement
Commitments And Contingencies Disclosure [Line Items]
Payment for legal settlement														0
Lease termination
Commitments And Contingencies Disclosure [Line Items]
Asset Retirement Obligations, Noncurrent												700,000		700,000
Performance guarantee | Private Placement
Commitments And Contingencies Disclosure [Line Items]
Other non-current liability												$ 9,000,000		$ 9,000,000							$ 30,000,000
Subsequent Event | APAT Arbitration
Commitments And Contingencies Disclosure [Line Items]
Damages awarded to company	¥ 0.7	$ 100,000
Scenario, Forecast | Russian federation
Commitments And Contingencies Disclosure [Line Items]
Exit fees for future																$ 2,000,000