Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share	2		2	0
Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share			1		1
Landmark [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	14.00%		11.00%
IQE Group Customer [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	10.00%		11.00%
Osram Opto [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share		1
Percentage share generated by major customers		10.00%
Major Customer One [Member] | Revenue [Member] | Maximum [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers				10.00%
Major Customer One [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers			19.00%		22.00%
Top Five Major Customers [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share	5	5	5	5
Percentage share generated by major customers	42.00%	37.00%	42.00%	36.00%