Commitment and Contingencies (Details)
$ in Millions |
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6 Months Ended |
|
Jun. 30, 2015
USD ($)
item
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Dec. 31, 2014
item
|
Jun. 30, 2015
USD ($)
item
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Jun. 30, 2014
item
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| Commitments and Contingencies. |
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| Cash held in escrow deposit | $ |
$ 10.6
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|
$ 10.6
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|
| Letter of credit with Silicon Valley Bank | $ |
$ 1.0
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$ 1.0
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| Accounts receivable. | Credit risk | Customers |
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| Customer Concentration |
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| Number of customers |
2
|
4
|
2
|
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| Concentration risk (as a percent) |
42.60%
|
69.90%
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| Accounts receivable. | Credit risk | Customer one |
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| Customer Concentration |
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| Concentration risk (as a percent) |
23.40%
|
30.20%
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| Accounts receivable. | Credit risk | Customer two |
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| Customer Concentration |
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| Concentration risk (as a percent) |
19.20%
|
16.00%
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| Accounts receivable. | Credit risk | Customer three |
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| Customer Concentration |
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| Concentration risk (as a percent) |
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13.40%
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| Accounts receivable. | Credit risk | Customer four |
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| Customer Concentration |
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| Concentration risk (as a percent) |
|
10.30%
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| Revenues. | Credit risk | Customers |
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| Customer Concentration |
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|
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| Number of customers |
3
|
|
3
|
2
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| Concentration risk (as a percent) |
|
|
95.10%
|
35.90%
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| Revenues. | Credit risk | Customer one |
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| Customer Concentration |
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| Concentration risk (as a percent) |
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|
68.80%
|
20.70%
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| Revenues. | Credit risk | Customer two |
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| Customer Concentration |
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| Concentration risk (as a percent) |
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|
16.10%
|
15.20%
|
| Revenues. | Credit risk | Customer three |
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| Customer Concentration |
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| Concentration risk (as a percent) |
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|
10.20%
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