Commitments and Contingencies Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 lease	Sep. 30, 2012	Dec. 31, 2011 lease	Dec. 31, 2012
Long-term Purchase Commitment [Line Items]
Operating lease payments	$ 191	$ 131	$ 575,000	$ 395,000
Number of non-cancelable lease agreements			3		2
Depreciation expense on the equipment under the capital leases	40	36	120	94
Current portion of capital lease	263		263			240
Capital lease, net of current portion	62		62			231
Lease 1 [Member]
Long-term Purchase Commitment [Line Items]
Value of non-cancelable capital lease agreements	38		38		512	90
Interest rates on non-cancelable capital lease agreements	8.80%		8.80%		6.00%	9.00%
Lease 2 [Member]
Long-term Purchase Commitment [Line Items]
Value of non-cancelable capital lease agreements					40	30
Interest rates on non-cancelable capital lease agreements					0.00%	3.00%
Lease 3 [Member]
Long-term Purchase Commitment [Line Items]
Value of non-cancelable capital lease agreements						$ 48
Interest rates on non-cancelable capital lease agreements						0.00%