Short-Term Borrowings (Details) (USD $)	0 Months Ended	3 Months Ended
	Mar. 14, 2014	Mar. 31, 2015	Dec. 31, 2014	Sep. 01, 2014	Feb. 17, 2015	May 30, 2014	Apr. 23, 2015
Line of Credit Facility [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		14,400,000
Line of Credit Facility, Amount Outstanding		10,000,000	10,000,000
Line of Credit [Member] | 2014 Debt Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	25,000,000
Line of Credit, Liquidity Threshold	15,000,000
Line of Credit, Liquidity Threshold, Last Month of Quarter	20,000,000
Line of Credit, Modification Fee	35,000
Line of Credit Facility, Commitment Fee Amount	35,000
Debt Instrument, Average Monthly Interest Expense	10,000,000
Line of Credit Facility, Cancellation Fee Percentage	1.50%
Line of Credit Facility, Covenant Compliance, Minimum Required Balance				4,000,000
Line of Credit Facility, Covenant Compliance, Minimum Cash Balance Required, Percent				50.00%
Line of Credit Facility, Debt Covenant, Liquidity	10,000,000
Convertible Senior Notes [Member] | 2015 Convertible Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt instrument, interest rate, stated percentage					4.50%
United States Accounts Receivable Balance [Member] | Line of Credit [Member] | 2014 Debt Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Borrowing Formula, Eligible Accounts Receivable			80.00%
Foreign Accounts Receivable Balance [Member] | Line of Credit [Member] | 2014 Debt Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Borrowing Formula, Eligible Accounts Receivable			65.00%
Maximum [Member] | Line of Credit [Member] | 2014 Debt Agreement [Member] | Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Minimum [Member] | Line of Credit [Member] | 2014 Debt Agreement [Member] | Prime Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Letter of Credit [Member] | Line of Credit [Member] | 2014 Debt Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						2,000,000
Line of Credit Facility, Current Borrowing Capacity	1,000,000
Line of Credit Facility, Borrowing Formula, Eligible Accounts Receivable, Days from Invoice Date		60 days
Subsequent Event [Member] | Letter of Credit [Member] | 2014 Debt Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 5,000,000