Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net (loss) income	$ (7,074)us-gaap_NetIncomeLoss	$ 7,390us-gaap_NetIncomeLoss	$ 4,993us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and other	28,365	24,694	23,261
Stock-based compensation expense	6,724us-gaap_ShareBasedCompensation	8,771us-gaap_ShareBasedCompensation	6,598us-gaap_ShareBasedCompensation
Impairment loss	3,558	0	0
Amortization of debt discount and deferred issuance costs	629	337	146
Loss on disposal of assets	0	202	101
Change in fair value of acquisition contingencies	(910)	80	0
Change in deferred tax assets and liabilities	(2,744)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,928)us-gaap_DeferredIncomeTaxExpenseBenefit	1,469us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefit from share-based compensation	0	(2,346)	(1,102)
Changes in assets and liabilities:
Accounts receivable	(4,547)	2,911	(17,924)
Inventories	2,862us-gaap_IncreaseDecreaseInInventories	(11,975)us-gaap_IncreaseDecreaseInInventories	(1,075)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current and non-current assets	787	(388)	135
Restricted cash	(2,158)	1,187	(2,156)
Accounts payable	4,380	(651)	1,545
Accrued payroll and related expenses	1,247	1,055	1,083
Income taxes payable	(1,036)	(3,523)	(119)
Deferred grant revenue	4,301	(127)	2,156
Other current and non-current liabilities	1,302	(7)	522
Net cash provided by operating activities	35,686	25,682	19,633
INVESTING ACTIVITIES
Acquisitions of property and equipment	(11,149)	(20,821)	(12,221)
Acquisition of BioHelix, net of cash acquired	0	(9,184)	0
Acquisition of AnDiaTec	0	(2,250)	0
Acquisition of intangibles	(92)	(1,680)	(15,501)
Purchase of business	0	0	(1,000)
Proceeds from sale of fixed assets	0	0	122
Net cash used for investing activities	(11,241)	(33,935)	(28,600)
FINANCING ACTIVITIES
Proceeds from issuance of convertible senior notes	172,500us-gaap_ProceedsFromConvertibleDebt	0us-gaap_ProceedsFromConvertibleDebt	0us-gaap_ProceedsFromConvertibleDebt
Proceeds from issuance of common stock, net of cancellations	4,781	7,928	4,664
Payments of debt issuance costs	(4,712)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefit from share-based compensation	0	2,346	1,102
Payments on lease obligation	(441)qdel_PaymentsOnLeaseObligation	(380)qdel_PaymentsOnLeaseObligation	(329)qdel_PaymentsOnLeaseObligation
Repurchases of common stock	(1,956)	(2,157)	(3,407)
Payments on line of credit	0	(5,000)	(37,000)
Payment of note payable to state agency	0qdel_PaymentOfNotePayableToStateAgency	0qdel_PaymentOfNotePayableToStateAgency	(1,498)qdel_PaymentOfNotePayableToStateAgency
Payments on acquisition contingencies	(2,112)qdel_PaymentOnAcquisitionContingency	(947)qdel_PaymentOnAcquisitionContingency	0qdel_PaymentOnAcquisitionContingency
Other	0	0	(1,041)
Net cash provided by (used for) financing activities	168,060	1,790	(37,509)
Effect of exchange rate changes on cash	2	(5)	0
Net increase (decrease) in cash and cash equivalents	192,507	(6,468)	(46,476)
Cash and cash equivalents, beginning of period	8,388	14,856	61,332
Cash and cash equivalents, at end of period	200,895	8,388	14,856
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for interest	981us-gaap_InterestPaid	1,807us-gaap_InterestPaid	2,086us-gaap_InterestPaid
Cash paid during the period for income taxes	327us-gaap_IncomeTaxesPaid	2,211us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
NON-CASH INVESTING ACTIVITIES
Purchase of capital equipment by incurring current liabilities	900	172	1,086
Purchase of licensed technology by incurring current liabilities	0	0	108
Lease incentive for tenant improvements	0	1,658	0
NON-CASH FINANCING ACTIVITIES
Decrease of accrued payroll and related expenses upon issuance of common stock	663us-gaap_StockIssued1	456us-gaap_StockIssued1	917us-gaap_StockIssued1
Debt issuance costs by incurring current liabilities	$ 365	$ 0	$ 0

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-URI http://asc.fasb.org/extlink&oid=6519514

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-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.19)

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-Number 210

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-Paragraph 20

-Article 9

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The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

+ References

No definition available.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

The fair value of stock issued in noncash financing activities.

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