Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flow from operating activities:
Net loss	$ (12,179)us-gaap_NetIncomeLoss	$ (11,476)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	425	149
Provision for excess inventory	(174)dsco_ProvisionForExcessInventory	766dsco_ProvisionForExcessInventory
Stock-based compensation and 401(k) Plan employer match	792	954
Fair value adjustment of common stock warrants	31us-gaap_FairValueAdjustmentOfWarrants	(378)us-gaap_FairValueAdjustmentOfWarrants
Amortization of discount on long-term debt	555	439
Changes in:
Inventory	201us-gaap_IncreaseDecreaseInInventories	(1,083)us-gaap_IncreaseDecreaseInInventories
Accounts receivable	0	67
Prepaid expenses and other current assets	245	75
Accounts payable	352	1,145
Accrued expenses	1,108	(1,059)
Deferred revenue	(43)	(54)
Other liabilities	27	176
Net cash used in operating activities	(8,660)	(10,279)
Cash flows from investing activities:
Purchase of property and equipment	(448)	(497)
Net cash used in investing activities	(448)	(497)
Cash flows from financing activities:
Proceeds from exercise of common stock options	0	31
Proceeds from exercise of common stock warrants	0us-gaap_ProceedsFromWarrantExercises	423us-gaap_ProceedsFromWarrantExercises
Repayment of equipment loans	(20)	(19)
Net cash (used in) provided by financing activities	(20)	435
Net decrease in cash and cash equivalents	(9,128)	(10,341)
Cash and cash equivalents - beginning of period	44,711	86,283
Cash and cash equivalents - end of period	35,583	75,942
Supplementary disclosure of cash flows information:
Interest paid	$ 649us-gaap_InterestPaid	$ 649us-gaap_InterestPaid

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