Business Combination - Allocation of Assets acquired, liabilites assumed and Purchase price (Details) - USD ($) $ in Thousands		4 Months Ended	9 Months Ended
	Jan. 02, 2015	Apr. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Liabilities assumed:
Goodwill			$ 1,115	$ 1,115
Tunable Laser Product Lines From EMCORE Corporation [Member]
Total purchase consideration:
Cash paid	$ 1,500	$ 1,500
Notes payable	16,000	15,482
Total consideration	17,500	$ 16,982
Fair value of assets acquired:
Accounts receivable	9,274
Inventories	1,693
Prepaid expenses and other current assets	670
Property, plant and equipment	6,917
Intangible assets acquired:
Intangible assets acquired			4,800
Fair value of assets acquired	23,354
Liabilities assumed:
Accounts payable	(7,427)
Accrued liabilities	(60)
Fair value of liabilities assumed total	(7,487)
Goodwill	1,115		$ 1,100	$ 1,100
Tunable Laser Product Lines From EMCORE Corporation [Member] | Developed Technology [Member]
Fair value of assets acquired:
Useful Life (in years)			7 years
Intangible assets acquired:
Intangible assets acquired	4,100		$ 4,100
Tunable Laser Product Lines From EMCORE Corporation [Member] | Customer Relationships [Member]
Fair value of assets acquired:
Useful Life (in years)			2 years
Intangible assets acquired:
Intangible assets acquired	$ 700		$ 700