CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 4,087us-gaap_NetIncomeLoss	$ (922)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation	354us-gaap_Depreciation	263us-gaap_Depreciation
Amortization of intangible assets	233us-gaap_AmortizationOfIntangibleAssets	231us-gaap_AmortizationOfIntangibleAssets
Share-based compensation	3,933us-gaap_ShareBasedCompensation	2,372us-gaap_ShareBasedCompensation
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(4,329)	(2,874)
Inventory	885us-gaap_IncreaseDecreaseInInventories	242us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(801)	(942)
Other assets	(26)	0
Accounts payable	1,789	128
Accrued compensation	(2,803)	(175)
Accrued expenses	1,111	(37)
Other liabilities	(223)	102
Net cash flows from operating activities	4,210	(1,612)
Cash flows from investing activities:
Purchases of equipment	(1,347)	(466)
Proceeds from Sale and Maturity of Held-to-maturity Securities	500	0
Patent application costs	(201)mdxg_PaymentsforApplicationCostsPatent	(168)mdxg_PaymentsforApplicationCostsPatent
Net cash flows from investing activities	(1,048)	(634)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,276	445
Proceeds from exercise of warrants	0us-gaap_ProceedsFromWarrantExercises	775us-gaap_ProceedsFromWarrantExercises
Stock repurchase	(12,295)us-gaap_ProceedsFromRepurchaseOfEquity	0us-gaap_ProceedsFromRepurchaseOfEquity
Payments under capital lease obligations	(29)	(33)
Net cash flows from financing activities	(11,048)	1,187
Net change in cash	(7,886)	(1,059)
Cash and cash equivalents, beginning of period	46,582	44,078
Cash and cash equivalents, end of period	$ 38,696	$ 43,019

Payments for Application Costs, Patent

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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